LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 1994 >> Probe GT, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - V6 >> Ignition Checks >> Electronic Ignition (EI) (High Data Rate) System >> Spark Check
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Spark Check

  1. Check the EI (high data rate) system (formerly Electronic Distributorless Ignition System - EDIS) for fault codes and repair if necessary. See QUICK TEST in appropriate article listed below. If no fault codes are present, check ignition system wiring harness connectors for corrosion and tight fit. See Fig 1, Fig 2, Fig 3 or Fig 4. Clean or repair connectors as necessary.
  2. If wiring and connectors are okay, use Neon Bulb Spark Tester (D89P-6666-A) to check for spark at each spark plug wire while cranking engine. If spark is strong and consistent at each spark plug (one spark per crankshaft revolution), ignition system is okay. If spark is not present, go to IGNITION SYSTEMS in appropriate SYSTEM/COMPONENT TESTS article listed below.
Fig 1: EI Sys. (High Data Rate) Elec. Diag. (3.8L Calif. & 3.0L Flex. Fuel)
G93C39489Courtesy of FORD MOTOR CO.
Fig 2: EI System (High Data Rate) Elec. Diagram (Mustang - 3.8L)
G94G31811Courtesy of FORD MOTOR CO.
Fig 3: EI Sys, (High Data Rate) Elec. Diag. (Cougar, Thunderbird - 4.6L)
G94H31812Courtesy of FORD MOTOR CO.
Fig 4: EI System (High Data Rate) Elec. Diagram (4.6L, Except Cougar & Thunderbird)
G93F39490Courtesy of FORD MOTOR CO.
scientia non olet · About LEMON Manuals